The majority of the stadiums with natural grass have open domes to aid in the growth of the natural grass. NRG Stadium, Lucas Oil Stadium and University of Phoenix were constructed with retractable roofs that allow direct sunlight on the grass when the weather permits.

The most unique grass stadium is the Arizona Cardinals University of Phoenix Stadium. This grass field was constructed on top of a tray, which is set on rails allowing it to be rolled in and out of the stadium depending on what event is being hosted. By placing the grass outside of the stadium until game day, the grass field remains in the sun getting the maximum amount of sunshine and nourishment.

Related Questions

In the National Football League, the term "waived" refers to cutting a player from the team with four seasons or less experience. The term "released" refers to cutting a veteran with more than four years accrued experience.

As of 2014, the top four all-time rushing leaders in the National Football League are Emmitt Smith, Walter Payton, Barry Sanders and Curtis Martin. All four have all been inducted into the Pro Football Hall of Fame.

As of 2014, there are white running backs in the NFL. They include Rex Burkhead of the Cincinnati Bengals, James Develin of the New England Patriots, Toby Gerhart of the Jacksonville Jaguars, Peyton Hillis of the New York Giants, Collin Mooney of the Tennessee Titans, Chase Reynolds of the St. Louis Rams and Danny Woodhead of the San Diego Chargers.

The break between the first and second halves of a National Football League game, known as halftime, is typically 12 minutes. This break occurs between the second quarter and third quarter of the football game.